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![Mechanization, Employment, and Output Per Man in Bituminous-Coal Mining- Vol. 1 by Willard E. Hotchkiss [et al.]](https://exploreuk.uky.edu/dips/xt79cn6xz88z/data/books_fw4_7_e_9_v1_xt79cn6xz88z/33362_ftb.jpg "Mechanization, Employment, and Output Per Man in Bituminous-Coal Mining- Vol. 1 by Willard E. Hotchkiss [et al.]")
